By Denny Dyroff, Entertainment Editor, The Times Popa Chubby Get ready to rock out, Kennett Square. On March 1, Kennett Flash (102 Sycamore Alley, Kennett Square, 484-732-8295, http://www.kennettflash.org) will host a show by Popa Chubby, one of America’s modern-day blues-rock/blues masters. Popa Chubby plays between 180 and 200 shows each year and his shows this weekend will be the last stateside...